Electric horn.



J. LANZ.

ELECTRIC HORN.

APPLIOATIOH FILED AUG. 18, 1910.

Patented Jan. 17, 1911.

IIVVENTOR WITNESSES.

ATTORNEY llNl'ilED STATES Pd lENT ()FFICE.

JOHN LANZ, or nANBUnYfcoN'NEo'rrcU'r, ASSIGNOR TO THE ROGERS TELEPHONE &

ELECTRIC coMPANY, or DANBURY, CONNECTICUT, A CORPORATION or CON- NEGTICUT.-

ELECTRIC non'N.

. Specification of Letters Patent.

Application filed August 18, 1910.

Patented Jan. 17, 1911. Serial No. 577,848.

useful improvements in electric horns and has for its object to provide a device of this description in which the vibrations shall be pronounced and positive, one vibration being produced by a diaphragm vibrated byelectrical impulses, while a second diaphragm ismechanically vibrated by the action of thefirst named diaphragm.

\Vith these ends in view my invention consists in the arrangement and combination of parts hereinafter fully described and then particularly pointed out in the claims which conclude this description.

In the accompanying drawing Figure 1 is a sectional elevation illustrating my improveIm-nt and, Fig. 2 a detail brokcnsection showing more particularly the manner of wiring.

Similar numerals of reference denote like parts in both figures of the drawing.

1 is the metal casing preferably provided with a lining 2, and 3 is an electro magnet suitably mounted within said casing. 4 is a diaphragm which rests upon said lining and has secured thereto an armature 5 in proximity to the magnetfi, and secured to the upper face of this diaphragm is a spring contact 6; 1

Resting upon an insulated ring 4 and separated from the dia hragm 4 by an air space is a second diap ragm 8, to the upper face of which is secured a block 9 through which a screw 10 is driven against the con? tact 6, and by means of the adjustment of this screw the normal distance between the armature and magnet is determined.

Resting upon the outer perimeter of the diaphragm 8 is an insulating ring 11-, and secured to the casing in any suitable manner is the horn nozzle 12, to which latterthe horn 13 is attached. 'The electrical connections are quite ordinary, one wire 14 being connected to an insulated binding post 15 to which latter is likewise connected one end of the magnet winding wire 16, the other magnet Wire end 17 being connected with the casing through the medium of any suitable binding post 18; the other electrical wire 21 is secured to the insulated post 19 and a wire 20 connects the latter with the upper'diaphragm 8. y

When the parts are in normal position the upper diaphragm 8 is always in electrical contact with the lower diaphragm through the medium of the spring 6 and screw 10, and therefore the magnet, the easing and the two diaphragms are always normally in electrical connection with the wire 14, while the return wire 20.1;0 which the battery (not shown) is attache is connected with the upper diaphragm 8, so that it will be clear that when the circuit is closed the magnet will be energized thereby attracting the armature and breaking the contact between the spring 6 and screw 10, whereupon contact will of course be broken with the battery wire and the armature will return to normal position thus vibrating the lower diaphragm 4. On the upward or return movement of the diaphragm 4 the contact spring 6-will strike against the screw' 10 and vibrate the upper diaphragm 8 mechanically. This diaphragm ,8 is perforated in any suitable manner as shown at 21 in orderto afford transmission of sound caused by the vibration of the inner diaphragm.

By the use of my improvementd obtain not only the benefit of the body of air between the diaphragms which is set in motion by the vibration of the lowef diaphragm, but the mechanical or positive vibrations of the outer diaphragm greatly accentuates the sound which latter is still further increased and materially softened by reason of the resilient contact between the two diaphragms.

I do not wish to be understood as claiming the use of two diaphragms separated by an air space where the inner diaphragm is 'yibrated either mechanically or by electrical impulses and the outer diaphragm vibrated by the disturbance of the air.

What I'do claim as new and desire to se cure by Letters Patent is 1. An electric horn, comprising inner and outer iaphragms that are spaced apart and insula d from each other, contact elements carried by said diaphragms and normally and cause the outer diaphragm to be mei chanically vibrated. I

2. An electric horn, comprising an electro magnet, lnner and outer spaced diaphragms insulated from each other, an armature carried by the inner diaphragm Within the field of said magnet, contact elements carried by said diaphragms, electrical connections between said magnet, diaphragms and one circuit wire, and electrical connections between the outer diaphragm and the other circuit wire.

3. An electric horn, comprising a casing, an electro magnet supported therein, spaced inner and outer diaphragms supported within said c: sing andi'nsulated from each other an armature secured to the inner diaphragm within the field of said'magnet, a resilient contact carried by the inner diaphragm, a contact screw carried by the outer diaphragm and normally engaging saidresilient contact, and suitable electrical connections whereby when the magnet is energized the inner diaphragm Will be vibrated and will thereby efi'ect mechanical vibrations of the outer diaphragm.

In testimony whereof I afiix my signature in presence of two Witnesses.

JOHN LANZ.

W itnesses F WV. SMITH, Jr., M. T. LONGDEN. 

